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PRELIMINARY EVALUATION OF A WATER CURTAIN FOR EDGE-OF-FEEDYARD SUPPRESSION OF FUGITIVE DUST
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 197-202 in Air Pollution from Agricultural Operations III, Proceedings of the 12-15 October 2003 Conference (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003. 701P1403.(doi:10.13031/2013.15512)
Authors: B. W. Auvermann, T. H. Marek, and J. M. Sweeten
Keywords: Fugitive dust, Feedyards, Water curtain, Dust control, PM10
We present the results of preliminary tests on a field-scale water curtain to control fugitive dust from a commercial feedyard in the Texas Panhandle. The water curtain is an open-air wet scrubber consisting of a linear array of elevated spray nozzles oriented such that the conical spray patterns are directed toward the ground. The spray patterns overlap to form a curtain of fine water droplets that “scrub” dust particles from the air. Previous, small-scale prototypes removed nearly 80% of total suspended particulate (TSP), but the system tested at that time operated at an extremely high specific flow rate of nearly 112 l min-1 m-1. The present, field-scale system operates at a more realistic specific flow rate of 15 l min-1 m-1, which is approximately equal to the water used by a conventional, solid-set sprinkler system operated 6 hours per day to suppress dust emissions from a cattle feedyard having a 1.6-km critical downwind frontage. Using an upwind/downwind sampling paradigm on three ideal monitoring dates in August 2002 and May 2003, the curtain appeared to remove about 40% of suspended particulate matter (PM) along the centerline of the water curtain's zone of influence. As the design is optimized, we expect the effectiveness of the water curtain to be greatest when winds are light and when turbulent mixing of the air is minimal – that is, atmospheric conditions under which human exposure to ground level, airborne PM is likely to be the greatest.
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